Notes
National Research Council publication ‘Wetlands: Characteristics and Boundaries’ (1995), Committee on Characterization of Wetlands, Water Science and Technology Board, Board on Environmental Studies and Toxicology, Commission on Geosciences, Environment, and Resources. Exhibit AR034578. Chapter 6 covers especially controversial wetlands including permafrost wetlands, riparian ecosystems, isolated and headwater wetlands, shallow wetlands, agricultural wetlands, nonagricultural altered sites, and transitional zones. Discusses permafrost definition (soil below 32°F/0°C for 2+ years), active layer (25-200 cm), Alaska wetlands (174.7 million acres, 63% of U.S. remaining wetlands), Food Security Act wetland definition, riparian zone definition within 100-year floodplain, and regulatory treatment of permafrost wetlands. References Hall et al. 1994, Ping et al. 1992, Brinson et al. 1981, National Wetlands Working Group 1988 (Canada).